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Solar Energy Manager
Solar Energy Manager is a solar power management module, which can charge the 3.7V 18650 lithium battery through solar panel or USB port. The module features MPPT (Maximum Power Point Tracking) and protection functions of battery charging and discharging. MPPT power point tracking can automatically adjust the charging power according to the input voltage, taking advantage of solar energy more efficiently. The protection circuit of charging and discharging can monitor the battery voltage in real time, preventing the battery from overcharging and over-discharging. It can protect the battery and prolong the battery life. Due to its excellent stability and efficient management of charging and discharging, it can be used in solar power generation, low-power IoT and other environmental protection projects.
Product Features
- Supports MPPT (Maximum Power Point Tracking) function, maximizing the efficiency of the solar panel
- Supports solar panel / power adapter/USB multiple methods of connections for battery charging
- Suitable for 5V-24V solar panel, being wiring through DC-044 power jack or terminal block
- On-board MPPT SET switch, select the level closed to input level to improve charging efficiency
- On-board two ways of 5V output connectors:One USB female socket and two sets of pin headers, convenient for users
- On-board high capacity aluminum electrolytic capacitor and SMD ceramic capacitor, reducing the ripple, working more stably
- On-board 18650 battery holder and PH-2P battery socket, convenient to connect multi kinds of 3.7V rechargeable Li battery or Li battery pack
- Onboard various status indicators for checking the status of solar panel and battery easily
- Mounting holes are compatible with Raspberry Pi 3/4/5 series motherboards
- The board supports simultaneous charging and discharging
- Multi protection circuits: over charge / over discharge / reverse protection / over current, stable and safe to use
Resource Profile
1. Solar charging connector: can be wired to the solar panel through the DC-044 power jack. 2. Solar charging connector: can be wired to the solar panel through the terminal. 3. USB charging connector: can use the power adapter to charge the battery through the TYPE-C data cable. 4. The switch of Battery，This switch should be turned to "ON" when charging the battery and outputs 5V and 3.3V.
5. USB output port: output 5V/2A power through the USB port. 6. Output boost chip: CN5305 boost chip. 7. Pin header output port: output 5V/2A and 3.3V/1A power through pin header of 2.54mm pitch. 8. Output status indicator. 9. 3.7V lithium battery expansion connector: 3.7V lithium battery can be expanded through the PH-2PWB connector, and the expanded lithium battery can be charged and discharged.
10. 18650 lithium battery holder. 11. The indicator of battery capacity. 12. Battery output activation button. After installing the battery correctly, turn the battery switch "Battery Switch" to "ON". If the "OUTPUT ON" indicator does not light up, you can press the button at this time.
13. The warning indicator for battery reverse connection : lights up to warn when the battery is reversely connected.
14. Lithium battery protection circuit: lithium battery overcurrent, overdischarge, overcharge protection circuit. 15. CN3791 solar charging chip.
16. DIP switch for setting MPPT voltage : Solar charging MPPT voltage setting DIP switch, set the MPPT voltage according to the charging voltage, which can improve the charging efficiency. The MPPT setting voltage should be less than or equal to the input voltage. The solar panel input and USB TYPE-C input cannot charge the battery at the same time, only one port can be selected to charge the lithium battery at any time.
17. Lithium battery charging indicator: Charge: the light is on when the lithium battery is charged through the solar panel or USB connector; Done: the light is on when the lithium battery is charged (Done flashes when the lithium battery is disconnected or not connected during the charging process).
18. Warning indicator for solar panel reverse connection: When the solar panel is wired to the Solar Energy Manager, if the positive and negative poles are reversed, the warning indicator will light up to give an alarm.
19. Lead out the battery charging status and battery power pins (the pin header is not soldered).
Dimensions
Doc
Reviewed in the United States on March 31, 2025
Battery indicator light stopped working after two days of use in a climate controlled environment.
T. Harward
Reviewed in the United States on March 21, 2025
Very full-featured all in one board that just works for the most part. My only complaint is that the 5v output voltage is quite low on my board, only 4.2V. Luckily my Raspberry Pi Zero W doesn’t seem to mind that, but it does surprise me a bit. Otherwise handles charging very well and I don’t need to monitor it or worry about it, set and forget.I also like that it has a port for a larger battery if you want, and support for up to 24v panels. So you could use this in some large scale projects if you really wanted.Agree with other people that I would prefer a “status check” button for a few seconds of LEDs rather than them being on all the time, but they’re so small SMD LEDs I expect the current draw is very small.
franz z.
Reviewed in Germany on April 8, 2025
Super Teil ..........tut was es soll
Patrick
Reviewed in France on April 15, 2025
Très bonne alim chargeur batterie , pour montages divers électroniques,une sortie 5 v performante et une 3v également ,très compacte elle peut s'insérer sur un robot comme sur la photo jointe
Ryan M.
Reviewed in the United States on August 22, 2024
I like the fact that this will accept an 18650 battery, and will charge from solar. The manual was somewhat adequate in describing what needed to be done to get the solar working. You will need to set the dip switches to 5v or 6v, etc for whatever solar you have coming into this board. Also, on the unit I received the battery pins needed to be bent our to accommodate a li-ion with the voltage protection caps. Since this is supposed to be used under a solar panel I would recommend using a li-ion battery with as many voltage protections as possible. Remember this will be attached to a solar panel that is exposed to direct sunlight, this will most likely be in a hot location.I think it is a bit of a missed opportunity that the USB-c port can only be used as an input. It would be fairly simple to allow the voltage out on that port but this was not done.My biggest technical complaint is based on the SOC or State of Charge indicator, and the settings for charging the battery(s) that you connect. At best charging the battery from solar the "DONE" light comes on when the voltage reached 3.5-3.7 volts. This board will stop the charging when the Done light is on. This is terrible as the fully charged voltage should be 4.2 volts. Additionally, the SOC indicator on the board seems to be showing 0 bars when the voltage reaches 3 volts. This might just be conservative programming but most Li-Ion batteries have a voltage cut off closer to 2.4 volts. With this solar charging the battery would only be used from 3.0v to 3.5v. For my battery that is only using about the middle 40% of the batteries capacity. I found the charge controller microchip is a CN3791. This reveals that there is a resistor that gives the signal for the charging to stop. This unfortunately means there is no device interface that you could adjust the setting on.
Marcel
Reviewed in Germany on August 17, 2024
Super charging all in one Lösung.Sie bietet alle Anschlüsse die man braucht und man kann sogar noch externe 18650 mit dazu anschließen.
Thom
Reviewed in France on May 15, 2024
Correction la surveillance basse arret batterie 2.9v fonctionne d ou correction de mon message et noté maintenant à 5 étoiles très bonne carte
Ted W.
Reviewed in the United States on October 29, 2024
Works fine. Note, however, that the power switch only controls battery power. USB-C input power is always passed through to 5/3.3v output. It would be nice if the power switch would fully disconnect power from the output pins.
Peter McKenna
Reviewed in the United States on July 6, 2023
I was looking for a quick solution for running an esp8266 with solar/battery. I tried making my own with a tp4056 and buck converter, and since I'm an overall novice in this world, I could never get it just right. The batteries always ended up dropping below shut off voltage and I would have to replace them. I saw this randomly and thought I'd try it. Works wonderfully. I've tried with a 6v panel and a 10v panel via the screw terminals, both charged the 18650 and ran the esp8266 via the usb out without issue. The only negative I could see is that the battery capacity LEDs are constantly on. If there was a status check button that would turn those on for a moment, that would be ideal. Otherwise I'm sure they can be removed if one is really trying to conserve battery. Clearly I'm not as there are definitely more power efficient ways to run an 8266 rather than the USB, but I digress. Bottom line: it just works and does exactly what I need it to do.
Matthew
Reviewed in Canada on December 19, 2023
I didn't like the capacity indicator as it shows a full charge from 50-100% hope it is durable otherwise connected it to a nice big panel will take some power measurements on a sunny day and update review later bms seems to function correctly stopping discharge at around 2.85v and stopping full charge at 4.16v have it connected to a 11ah big brand battery at the moment mppt switch is too small to actuate with hands you will have to use something like a toothpick
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